1. 阅读理解

In the movie, The Day After Tomorrow, many climate changes including an ice age are caused by global warming. Much of the science in the movie has been questioned by people. However, there may be some truth to the idea in the movie that global warming could cause an ice age.

The theory starts with an understanding of why Europe and Scandinavia are not colder already. After all, other places at the same latitude(纬度) are covered with ice. The ocean current called the Gulf Stream brings warm waters from the Caribbean to the UK and Europe. These waters warm the countries around their path. This is why the UK, Europe and Scandinavia have a warmer climate than Alaska. Global warming has nothing to do with this. Global warming is significant. It could slow the Gulf Stream, or even stop it. If this were to happen, the cold waters would stay in the area of Europe, the UK, Scandinavia and the Northeastern US. It could mean an ice age for those regions.

Some weaknesses in the Gulf Stream could happen for different reasons. These days, it could happen due to global warming, caused by human activities, such as the burning of fossil fuels.

If a new ice age happened, it would probably be caused by the melting of the polar ice. This will lead large quantities of cold and fresh water to come into the ocean, which would disrupt the Gulf Stream and cause the cooling of many areas that now have a mild climate.

Scientists have gathered a lot of data from the oceans and the land to try to determine whether an ice age could be caused by global warming. With all this information at hand, it appears that it is indeed possible that global warming could lead to an ice age.

1. （1） According to the text, which of the following statements is TRUE?

   A . Global warming has created a warmer climate in some European countries. B . The Gulf Stream plays an important role in the warm climate of some European countries. C . Only the burning of fossil fuels can cause global warming. D . The climate of Alaska is also affected by the Gulf Stream.
3. （2） By saying "Global warming is significant." the author means the following EXCEPT______.

   A . the Gulf Stream will be slowed down or stopped B . the cold water will stay in the ocean of these areas C . people don't have to suffer from cold D . an ice age is just waiting to happen in some areas
5. （3） What is the meaning of the underlined word "current" in Paragraph 2?

   A . In common or general use. B . Of the present time. C . Stream of water. D . Flow of electricity.
7. （4） What's the main purpose of this passage?

   A . To warn people of the dangerous effects of global warming. B . To prove that the polar ice will disappear. C . To prove that a new ice age is no way to come. D . To introduce the causes and effects of the Gulf Stream.